/*
 * Copyright (c) 2002-2018 ymnk, JCraft,Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions
 * and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided with
 * the distribution.
 *
 * 3. The names of the authors may not be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL JCRAFT, INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jcraft.jsch;

import java.io.InputStream;
import java.io.OutputStream;

public class ChannelDirectTCPIP extends Channel {

  private static final int LOCAL_WINDOW_SIZE_MAX = 0x20000;
  private static final int LOCAL_MAXIMUM_PACKET_SIZE = 0x4000;
  private static final byte[] _type = Util.str2byte("direct-tcpip");
  String host;
  int port;

  String originator_IP_address = "127.0.0.1";
  int originator_port = 0;

  ChannelDirectTCPIP() {
    super();
    type = _type;
    lwsize_max = LOCAL_WINDOW_SIZE_MAX;
    lwsize = LOCAL_WINDOW_SIZE_MAX;
    lmpsize = LOCAL_MAXIMUM_PACKET_SIZE;
  }

  @Override
  void init() {
    io = new IO();
  }

  @Override
  public void connect(int connectTimeout) throws JSchException {
    this.connectTimeout = connectTimeout;
    try {
      Session _session = getSession();
      if (!_session.isConnected()) {
        throw new JSchException("session is down");
      }

      if (io.in != null) {
        thread = new Thread(this::run);
        thread.setName("DirectTCPIP thread " + _session.getHost());
        if (_session.daemon_thread) {
          thread.setDaemon(_session.daemon_thread);
        }
        thread.start();
      } else {
        sendChannelOpen();
      }
    } catch (Exception e) {
      io.close();
      io = null;
      Channel.del(this);
      if (e instanceof JSchException) {
        throw (JSchException) e;
      }
    }
  }

  @Override
  void run() {

    try {
      sendChannelOpen();

      Buffer buf = new Buffer(rmpsize);
      Packet packet = new Packet(buf);
      Session _session = getSession();
      int i = 0;

      while (isConnected() && thread != null && io != null && io.in != null) {
        i = io.in.read(buf.buffer, 14, buf.buffer.length - 14 - _session.getBufferMargin());
        if (i <= 0) {
          eof();
          break;
        }
        packet.reset();
        buf.putByte((byte) Session.SSH_MSG_CHANNEL_DATA);
        buf.putInt(recipient);
        buf.putInt(i);
        buf.skip(i);
        synchronized (this) {
          if (close)
            break;
          _session.write(packet, this, i);
        }
      }
    } catch (Exception e) {
      // Whenever an exception is thrown by sendChannelOpen(),
      // 'connected' is false.
      if (!connected) {
        connected = true;
      }
      disconnect();
      return;
    }

    eof();
    disconnect();
  }

  @Override
  public void setInputStream(InputStream in) {
    io.setInputStream(in);
  }

  @Override
  public void setOutputStream(OutputStream out) {
    io.setOutputStream(out);
  }

  public void setHost(String host) {
    this.host = host;
  }

  public void setPort(int port) {
    this.port = port;
  }

  public void setOrgIPAddress(String foo) {
    this.originator_IP_address = foo;
  }

  public void setOrgPort(int foo) {
    this.originator_port = foo;
  }

  @Override
  protected Packet genChannelOpenPacket() {
    Buffer buf = new Buffer(50 + // 6 + 4*8 + 12
        host.length() + originator_IP_address.length() + session.getBufferMargin());
    Packet packet = new Packet(buf);
    // byte SSH_MSG_CHANNEL_OPEN(90)
    // string channel type //
    // uint32 sender channel // 0
    // uint32 initial window size // 0x100000(65536)
    // uint32 maxmum packet size // 0x4000(16384)
    packet.reset();
    buf.putByte((byte) 90);
    buf.putString(this.type);
    buf.putInt(id);
    buf.putInt(lwsize);
    buf.putInt(lmpsize);
    buf.putString(Util.str2byte(host));
    buf.putInt(port);
    buf.putString(Util.str2byte(originator_IP_address));
    buf.putInt(originator_port);
    return packet;
  }
}
